the direct torque control (dtc) of interior permanent magnet synchronous motor (ipmsm) offers simple structure and fast torque response. the conventional switching table-based dtc (st-dtc) presents some disadvantages like high torque and flux ripple and also variable switching frequency. this paper investigates the improved st-dtc strategies to reduce both torque and flux ripple in dtc of ipmsm...

Magnetization reversal in a many-spin nanomagnet subjected to an rf magnetic field, on top of DC is studied by numerically solving the system coupled (damped) Landau-Lifshitz equations. It demonstrated that spin-misalignment induced surface anisotropy favors switching with field weaker than Stoner-Wohlfarth for optimal intensities and frequencies field.

In recent years many works are aimed at finding a method of controllable switching between hydrophilicity and hydrophobicity of a surface. The hydrophilic surface state is generally determined by its energy. Change in the surface energy can be realized in several different ways. Here we report the ability to control the surface wettability of zirconium dioxide nano-coatings by changing the comp...

Nanoscale polarization switching in ferroelectric materials by piezoresponse force microscopy in weak and strong indentation limits is analyzed using exact solutions for coupled electroelastic fields under the tip. Tip-induced domain switching is mapped on the Landau theory of phase transitions, with domain size as an order parameter. For a point charge interacting with a ferroelectric surface,...

Abstract: The paper presents the solution of the time optimal control with the help of Gröbner Bases theory. First the set of polynomial equations for the triple integrator system with unknowns corresponding to the switching times is constructed and later it is solved in the computer algebra system Maple using the Groebner library. In dependence of resulting switching times the control action i...

Controlling the wettability of a solid surface is important for myriad applications, ranging from self-cleaning surfaces to microfluidics to biomedicine. Recently, a variety of smart surfaces with reversibly switchable wettability have been developed. The reversible switching is realized through the adjustment of electrical potential, temperature, 8] and light illumination, adsorption of biopol...